Employment exchange? (5)
I believe the answer is:
trade
This clue is a double definition.
'employment' is the first definition.
(thesaurus)
'exchange?' is the second definition.
(I know that trade is a type of exchange)
(Other definitions for trade that I've seen before include "some say should be fair?" , "Barter, do business" , "Dealing in goods" , "Skilled occupation" , "Calling" .)